Patients with keratoconus always have a cone-like cornea, which deflects light on its way to retina. In one or both eyes, keratoconus may cause vision distortion.

As a progressive eye disease, keratoconus develops slowly. Since the cornea is always thinning, nearsightedness and irregular astigmatism may develop at certain stages of keratoconus, bringing distorted and blurry vision. Other symptoms of keratoconus include glare, light sensitivity and changing prescription.

Among various treatments for keratoconus, Intacs corneal inserts or implants are special that they insert two tiny and clear pieces of plastic polymer (intacs) into the cornea. Firstly approved for mild myopia, the Intacs implants now have been approved to be described as corneal implants for keratoconus treatment, rather than prescription inserts. Corneal implants are designed for long-term vision correction and have receives satisfying results from clinical trials and practices.